CSI to low

[Perpetual summer]

Pool is a fiberglass shell.
here are today’s numbers,
fc = 8
ph = 7.4
ta = 80
ch = 260
csi = -0.47

ph, ta, and ch have held steady for weeks, csi is slightly on the negative side. Poolmath says I should be above -0.3. Should I be concerned? Should I play around with another number to increase CSI?

 

[mknauss]

Do you have waterline tile with cementatious grout?

 

[Jimrahbe]

ps,

It is best to stay above -.3 CSI..

I would let the pH and/or the CH come up a little..

If your pH was 7.8 (Where most SWCG pools like it) and your CH was 300 your CSI would be about -.05

Does your pH stay at 7.4 or do you have to continually add MA to knock it down???

Thanks,

Jim R.

 

[duraleigh]

Posting your CYA would mean a lot more. Fiberglass doesn't really care about csi.

 

[Perpetual summer]

My cya is 70
no waterline tile, just fiberglass
last year my ph stayed at 7.6, ta = 90 and ch = 270.
this year ph= 7.4 ta= 80 and ch 260. Same as last year numbers held all summer didn’t add anything except chlorine to supplement SWG.

 

[mknauss]

You do not need to concern yourself with CSI. Keep your levels in the ranges shown Pool School - Recommended Levels